访问JPA< persistence-unit-metadata>编程 [英] Access JPA <persistence-unit-metadata> programmatically
问题描述
是否可以通过Java API访问< persistence-unit-metadata>
中的信息?
is it possible to access the information in <persistence-unit-metadata>
through Java API?
<persistence-unit-metadata>
<persistence-unit-defaults>
<schema>MySchema</schema>
</persistence-unit-defaults>
</persistence-unit-metadata>
我想通过JPA API或EclipseLink API读取模式MySchema,这是实现我用。
I would like to read the schema "MySchema" via JPA API or EclipseLink API, which is the implementation I use.
类似于:entityManager.getDefaults()。getSchema();
可以投射或使用任何EclipseLink类,这对此很好。
Something like: entityManager.getDefaults().getSchema(); It's OK to cast or use any EclipseLink class, that's fine for this.
谢谢
推荐答案
调试一段时间后,我找到了一个访问实体模式的解决方案。
After debugging for a while I found a solution to access the schema of an entity.
EntityType<MyEntity> entity = emf.getMetamodel().entity(MyEntity.class);
EntityTypeImpl entityTypeImpl = (EntityTypeImpl) entity;
ClassDescriptor descriptor = entityTypeImpl.getDescriptor();
String schema = descriptor.getDefaultTable().getTableQualifier();
寻找更简单,更好的方式来访问信息!
非常感谢你。
Looking for an easier and better way to access the information! Thank you so much.
这篇关于访问JPA< persistence-unit-metadata>编程的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!